Question

Which of the following statement(s) is/are incorrect ?

• A. SbH3> NH3> ASH3 > PH3 (boiling point)
• B. H3PO4> H3PO3> H3PO2 (reducing character)
• C. N2O < NO < N2O3< N2O5 (oxidation state on nitrogen atom)
• D. NH3> PH3>ASH3> SbH3 $\geq$ BiH3 (basicity)

Answer 1

Answer: (B)

H3PO4> H3PO3> H3PO2 (reducing character)

Answer 2

Correct order is : H3PO2 > H3PO3 > H3PO4

as number of reducing hydrogen decreases. Reducing nature decreases.

Note : Hydrogen atom directly attached to phosphorus is called reducing hydrogen.